A goody-two shoes; an excessively or annoyingly virtuous person. One who abstains from drug use, sex, profanity, or other poor habits.
She doesn't smoke, drink, or curse so she's obviously a Mary Poppins.

I don't want to hang out with a Mary Poppins because she's likely to ruin a party with her good girl manners and butt kissing tendencies.
by doubledotted October 29, 2010
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The action of popping MDMA pill(s) and smoking marijuana in a short amount of time.
Yesterday I did a Mary Poppins. I was so high!
by magicjs360 August 18, 2017
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A sexual act consisting of inserting an umbrella into your partner's vagina, and then opening it.
That bitch wanted to use a ball-stretcher on me, so I gave her a Mary Poppins to show her what it was like!
by Honkey Kong October 11, 2007
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A woman that likes to give brain in the front seat of the hummer while another man gives it to her up the "Chim Chimminey".
"Dude my friend and I totally pulled a Mary Poppins on that chick last night man!"
by Kathy Najimy March 20, 2009
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Whenever someone wears white socks with black shoes or black socks with white shoes.
"Aye what up Mary Poppins!"
by Dara Khani June 2, 2012
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